>means that LD BC,$F00F = 01F00F ....much easier than i assumed outta the >books from trilog :) The Zilog books are free you know, and only take a few weeks to get. The books are extrememly detailed, it goes over every combination of opcodes, the flags they modify, an example. It also shows some software uses of the Z80, introduces interrupts, goes over the registers, the uses of all the flags, etc -Matt